| Snake |
Average Length |
| Rattlesnakes |
|
| Eastern diamondback (Crotalus adamateus) |
33–65 in (84–165 cm) |
| Western diamondback (Crotalus atrox) |
30–65 in (76–419 cm) |
| Timber rattlesnake (Crotalus horridus horridus) |
32–54 in (81–137 cm) |
| Prairie rattlesnake (Crotalus viridis viridis) |
32–46 in (81–117 cm) |
| Great Basin rattlesnake (Crotalus viridis lutosus) |
32–46 in (81–117 cm) |
| Southern Pacific rattlesnake (Crotalus viridis helleri) |
30–48 in (76–122 cm) |
| Red diamond rattlesnake (Crotalus ruber ruber) |
30–52 in (76–132 cm) |
| Mojave rattlesnake (Crotalus scutulatus) |
22–40 in (56–102 cm) |
| Sidewinder (Crotalus cerastes) |
18–30 in (46–76 cm) |
| Moccasins |
|
| Cottonmouth (Agkistrodon piscivorus) |
30–50 in (76–127 cm) |
| Copperhead (Agkistrodon contortrix) |
24–36 in (61–91 cm) |
| Cantil (Agkistrodon bilineatus) |
30–42 in (76–107 cm) |
| Coral snakes |
|
| Eastern coral snake (Micrurus fulvius) |
16–28 in (41–71 cm) |
